I find that it's always interesting to THEN consider, okay -- while there's no centralized board or anything -- what does e.g. American censorship go after?
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Easy example: compare the Marvel "Civil War" comics to the movies. The former was critical of the military in a way that could not happen in any big blockbuster movie.
The question is why the people making the content in the US and China don't want to certain content. Is it because they're worried it won't be popular or because they're worried that it will be popular.
I can't prove anything (how would you?) but I tend to think in the U.S. it's the former and in the China the later.
This is not outright government censorship - you can still make a picture that says “the US military sucks” - but it certainly has an effect on big-budget films that want every dollar they can get.